The interest earned on 8000 from Jan to July will be 8000×5×
1
100
(Since rate of interest is 5 % per 6 months) = 80×5=400 Hence, 8000 will amount to 8400. He adds another 8000 to this. So the net amount becomes 8400+8000=16,400. Now interest earned on this amount in a period of 6 months will be 16400×5×
1
100
=820 So the final amount will be 16400+820=17220 Total money he deposited = 8000+8000=16000 Hence, amount earned via interest = 17220−16000=1220